We demonstrate for WDM optical networks a wavelength router with substantially reduced losses using a novel waveguide grating design [1]. This technique will increase in an optical network the maximum distance that can be effectively covered by the router without amplifiers. It will also reduce, in a packet switch, the ...

We study the satisfiability problem associated with XPath in the presence of DTDs. This is the problem of determining, given a query $p$ in an XPath fragment and a DTD $D$, whether or not there exists an XML document $T$ such that $T$ conforms to $D$ and the answer of ...

This paper proposes a new CCIT mirror design that utilizes shuttle-rocker-arm actuators to raise the effective pivot point of each mirror element to the midpoint of the elements top surface. This permits a 98% fill factor. The piston, tip, and tilt degrees of freedom are independent and each can be ...

Web Services fail to deliver on the promise of ubiquitous deployment and seamless interoperability due to the lack of a uniform, standards-based approach to all aspects of security. In particular, the enforcement of access policies in a Service Oriented Architecture is not addressed adequately. We present a novel approach to ...

There is currently no widely accepted method for converting packet-based measurements of Quality-of-Service (QoS) into a score reflecting a user's opinion of network performance. Such a measure is desirable for comparing networks, making design trade-offs, or enforcing service-level agreements (SLAs), and is likely to be a popular area of future ...

We study how photon absorption losses degrade the bipartite entanglement of entangled states of light. We consider two questions: (i) what state contains the smallest average number of photons given a fixed amount of entanglement? and (ii) what state is the most robust against photon absorption? We explain why the ...

We describe an implementation of the physical layer circuit for 100Mb/s optical Ethernet using an FPGA device with embedded high-speed serial transceivers. The design is the foundation for implementing a dual-speed 100/1000 Mb/s Ethernet system in which all components except the optical ones are implemented in an FPGA. Such a ...

We study large networks of subscriber stations (SSs) with certain common wireless capabilities, and base stations (BSs) having direct connection to the wired infrastructure in addition to common wireless capabilities. SS nodes can communicate with the "outside world" only through the BSs. Connections to SSs without a direct (i.e., a ...

Wireless backhaul communication is expected to play a significant role in providing the necessary backhaul resources for future high rate wireless networks. Mesh networking, in which information is routed from source to destination over multiple wireless links, has potential advantages over traditional single hop networking especially for backhaul communication. We ...

Location is valuable information in personal communication systems. Various communication mechanisms, e.g. PSTN, cellular, and soft IP phones, SMS, MMS, email, instant messaging, and real-time video streaming, are economically available today. An interesting issue is how to combine the location-based service and a variety of communications services together. We present ...

The nonlinear dynamics of doubly-degenerate vector four-wave mixing (FWM) are studied analytical and numerically, in phase space and in Stokes space. Depending on the initial conditions, vector FWM can evolve aperiodically or periodically, but not chaotically. The dynamics of vector FWM are similar to, but richer than, the dynamics of ...

Optical switching in a load-balanced architecture can be exploited to build highly scalable packet switches. In this paper we present the architecture of the Integrated Router Interconnected Spectrally (IRIS), an all-optical router that scales to hundreds of Terabits per second. IRIS is based on a novel implementation of a load-balanced ...

We study RF propagation in a medium-size conference room using the WiSE tool, which is a ray tracing model that has been developed for designing indoor wireless communication systems. A single specific room geometry is simulated but multiple narrowband realizations are obtained over a range of frequencies centered at 2.4 ...

This paper explores the enhancement of WLAN downlink throughput in a conference room environment using a multi-antenna access point. The downlink transmission uses antenna patterns to spatially separate multiple users so that they can be simultaneously served, rather than sequentially, thereby speeding up the downlink throughput. This can be useful ...

We show that there is no $(loglog M)^{1-ve}$ approximation for the undirected congestion minimization problem unless $NP subseteq ZPTIME(n^{polylog~n})$, where $M$ is the size of the graph and $ve$ is any positive constant.

We show that there is no $log^{{1over 3}-ve} M$ approximation for the undirected Edge-Disjoint Paths problem unless $NP subseteq ZPTIME(n^{polylog~n})$, where $M$ is the size of the graph and $ve$ is any positive constant. This hardness result also applies to the undirected All-or-Nothing Multicommodity Flow problem and the undirected Node-Disjoint ...

We present a linear-programming approach for dynamic load balancing in CDMA networks. The linear program characterizes the minimum achievable amplifier load for a given user configuration at each time interval, and gives a useful benchmark for the potential gains from optimizing the power assignment. The solution of the linear program ...

The development of newer generations of technology has created the opportunity and need for wireless providers to upgrade their networks (e.g. 2G to 3G), while market forces require them to maximize the use of their capital and preexisting investments. Upgrades in technology not only offer additional services but also performance ...

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